And we have research now that hypothesizes that Omicron incubated in mice and then jumped back to humans. If that hypothesis is true, then we have a fine example of something running in the background in a reservoir and then Hey, Presto! suddenly appearing to be mutated specifically for humans. If that's true, then all manner of "weird" things suddenly become both plausible and probable without any human intervention…
Isn't this the case with all zoonotic viruses? The reservoir is all the other species? HIV was also found in monkeys. We are all affected by the reservoir because we are also part of the reservoir.